I got my initial Tier 1 Visa on 12May, 2009 along with my dependants (My wife and my daughter). I applied this application from within UK.(My dependent were staying with me as work permit dependent in UK at the time of initial tier 1 general visa application [PBS based]).
Now I am in the process of applying for the extension of my Tier 1 Visa this week as my current Tier 1 general visa is valid till 12 May,2012 and need few clarifications regarding below mentioned points.
1) What documents I need to submit to show that my dependent are staying with me. Please note that I had furnished my Marriage Certificate and my daughter's birth certificate at the time of my initial tier 1 dependant application along with their passport. Also my wife's passport has my name as her spouse.
2) My concern is that though they stay with me in UK, but my wife/daughter does not have any bank account or utility bill on her name so is it sufficient to furnish original Marriage Certificate / Birth certificate again with the application...? If this is not sufficient then what kind of other documents I can furnish to claim that they stay with me...I am really confused...

3) I am showing My bank account statement as an evidence for maintenance fund for my dependants. Is it mandatory to have bank account on my wife/daughter name and have the required fund in thier respective account ..?
Please give your valuable advice to address above mentioned points.
Regards,
Neeraj